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Another very cool thing NUKE does for you is it allows you
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to enter expressions into these boxes.
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So if I had a very simple equation, like 1+1 for example,
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like I'll type in here, and I hit Enter,
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it's going to do the math for you and it's just going to give
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you whatever the result of that equation is.
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So that's not so useful in a skew box, so I'm going to set that back to 0,
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and I'm going to show you where I use it the most.
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I'm going to drop a new Transform into this comp,
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and I'm going to connect it to our master image,
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and we'll see that if I press 1 on the keyboard and view this master image,
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it is a 1920x1280 image, and if I go and I look at this Transform,
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we'll see that the manipulator for this transform,
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this crosshairs here is a little off center,
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and usually you have to go in and center these things all the time.
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And so this is where the expressions become really helpful
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because I can go right to the center attribute,
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and I can say, well, this image is 1920,
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and I want the center, so I'm going to divide by 2,
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and this is a 1280, and I want this centered,
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so I'm going to divide by 2,
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and that's going to drop the crosshairs right into the center of the image.
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And you can see the difference between where we started and where we ended here.
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It's also important to note here what we're seeing is two
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manipulators for two different Transform nodes,
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and while I have both of these Transforms from my comp,
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this Transform here and this Transform here selected
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and available in the Properties menu,
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it's showing me the manipulator for both of these nodes.
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So, if I want to get rid of this manipulator,
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for example, that's tied to the Transform1 down here,
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I'll just close that box and that will go away,
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and so now I'm only looking at the manipulator from this Transform,
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which is this node here.
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And if you get confused,
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just go back and use those buttons that we showed you in an earlier clip,
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click on the target,
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and it'll center you right up on the node that's being manipulated.
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Now if I want a very fine level of control over these numbers,
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so if I want to move the center of this manipulator
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now by let's say the ones place, I can put the cursor in the ones place,
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and I can hold Ctrl on the keyboard, and I can hit up,
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and I can hit down, and I can have very fine control over that manipulator.
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If I want to move it in increments of 10,
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I'll just put the cursor here and do the same thing,
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I'm holding down Ctrl on the keyboard and pressing up and pressing down,
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and that will increment it by units of 10.
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Likewise, if I put it here, it will increment by units of 100.
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You can see I have a very rough level of control.
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NUKE also has an option called virtual sliders.
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So if I select this attribute here and hold down Ctrl on the keyboard,
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I can hold down the middle-mouse button and get a very fine
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detail of control by just sliding the cursor from the left to
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the right to determine the exact, exact number that I want.
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And if you want a more course level of control,
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hold down the Ctrl and the Shift button,
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the numbers are moving in a much bigger range.
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In the next clip, we're going to take a look at these buttons here,
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and how they're used to animate each one of these values that you see.
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This is going to be the beginning of setting up animation in NUKE,
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and we're going to take a look at setting keyframes,
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deleting keyframes,
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and how we can share data in between each one of these attributes,
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and even how we can share data in between each one of these nodes.
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